package com.ruoyi.web.controller.common;

import java.io.ByteArrayOutputStream;
import java.io.FileInputStream;
import java.net.URLEncoder;
import java.util.ArrayList;
import java.util.List;
import java.util.zip.ZipEntry;
import java.util.zip.ZipOutputStream;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import com.ruoyi.system.domain.SysFileInfo;
import com.ruoyi.system.service.ISysFileInfoService;
import io.swagger.annotations.Api;
import io.swagger.annotations.ApiOperation;
import org.apache.commons.io.IOUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.http.MediaType;
import org.springframework.web.bind.annotation.*;
import org.springframework.web.multipart.MultipartFile;
import com.ruoyi.common.config.RuoYiConfig;
import com.ruoyi.common.constant.Constants;
import com.ruoyi.common.core.domain.AjaxResult;
import com.ruoyi.common.utils.StringUtils;
import com.ruoyi.common.utils.file.FileUploadUtils;
import com.ruoyi.common.utils.file.FileUtils;
import com.ruoyi.framework.config.ServerConfig;

/**
 * 通用请求处理
 *
 * @author ruoyi
 */
@Api(tags="上传下载")
@RestController
@RequestMapping("/common")
public class CommonController
{
    private static final Logger log = LoggerFactory.getLogger(CommonController.class);

    @Autowired
    private ServerConfig serverConfig;

    @Autowired
    private ISysFileInfoService sysFileInfoService;

    private static final String FILE_DELIMETER = ",";

    /**
     * 通用下载请求
     *
     * @param fileName 文件名称
     * @param delete 是否删除
     */
    @ApiOperation("通用下载请求")
    @GetMapping("/download")
    public void fileDownload(String fileName, Boolean delete, HttpServletResponse response, HttpServletRequest request)
    {

        try
        {
            if (!FileUtils.checkAllowDownload(fileName))
            {
                throw new Exception(StringUtils.format("文件名称({})非法，不允许下载。 ", fileName));
            }
            String realFileName = System.currentTimeMillis() + fileName.substring(fileName.indexOf("_") + 1);
            String filePath = RuoYiConfig.getDownloadPath() + fileName;

            response.setContentType(MediaType.APPLICATION_OCTET_STREAM_VALUE);
            FileUtils.setAttachmentResponseHeader(response, realFileName);
            FileUtils.writeBytes(filePath, response.getOutputStream());
            if (delete)
            {
                FileUtils.deleteFile(filePath);
            }
        }
        catch (Exception e)
        {
            log.error("下载文件失败", e);
        }
    }

    /**
     * 通用下载请求
     *
     * @param urls    /profile/开头的URL
     * @param zipName 生成的压缩包名称
     */
    @ApiOperation("下载多个文件，服务器打成压缩包")
    @PostMapping("/downloadZip")
    public void fileDownload(@RequestParam("urls") List<String> urls, @RequestParam("zipName") String zipName, HttpServletResponse response, HttpServletRequest request) {
        try {
            if (zipName.isEmpty()) {
                zipName = String.valueOf(System.currentTimeMillis());
            }
            ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
            ZipOutputStream zip = new ZipOutputStream(outputStream);

            for (String url : urls) {
                if (!FileUtils.checkAllowDownload(url)) {
                    throw new Exception(StringUtils.format("文件名称({})非法，不允许下载。 ", url));
                }
                String realFileName = System.currentTimeMillis() + url.substring(url.indexOf("_") + 1);
                String filePath = RuoYiConfig.getProfile() + url.substring(8);

                zip.putNextEntry(new ZipEntry(realFileName));
                FileInputStream inputStream = new FileInputStream(filePath);
                int temp = 0;
                while ((temp = inputStream.read()) != -1) {
                    zip.write(temp);
                }
                zip.flush();
                zip.closeEntry();
                inputStream.close();
            }
            IOUtils.closeQuietly(zip);

            response.reset();
            response.addHeader("Access-Control-Allow-Origin", "*");
            response.addHeader("Access-Control-Expose-Headers", "Content-Disposition");
            response.setHeader("Content-Disposition", "attachment; filename=\"" + URLEncoder.encode(zipName, "UTF-8") + ".zip\"");
            response.addHeader("Content-Length", "" + outputStream.toByteArray().length);
            response.setContentType("application/octet-stream; charset=UTF-8");
            IOUtils.write(outputStream.toByteArray(), response.getOutputStream());
        } catch (Exception e) {
            log.error("下载文件失败", e);
        }
    }


    /**
     * 通用上传请求（单个）
     */
    @ApiOperation("通用上传请求（单个）")
    @PostMapping("/upload")
    public AjaxResult uploadFile(MultipartFile file) throws Exception
    {
        try
        {
            // 上传文件路径
            String filePath = RuoYiConfig.getUploadPath();
            // 上传并返回新文件名称
            String fileName = FileUploadUtils.upload(filePath, file);
            String url = serverConfig.getUrl() + fileName;
            AjaxResult ajax = AjaxResult.success();
            ajax.put("url", url);
            ajax.put("fileName", fileName);
            ajax.put("newFileName", FileUtils.getName(fileName));
            ajax.put("originalFilename", file.getOriginalFilename());

            SysFileInfo sysFileInfo = new SysFileInfo();
            sysFileInfo.setOriginalName(file.getOriginalFilename());
            sysFileInfo.setUrl(fileName);
            sysFileInfo.setExtName(file.getOriginalFilename().substring(file.getOriginalFilename().lastIndexOf(".") + 1));
            sysFileInfoService.save(sysFileInfo);

            ajax.put("id", sysFileInfo.getId());
            return ajax;
        }
        catch (Exception e)
        {
            return AjaxResult.error(e.getMessage());
        }
    }

    /**
     * 通用上传请求（多个）
     */
    @ApiOperation("通用上传请求（多个）")
    @PostMapping("/uploads")
    public AjaxResult uploadFiles(List<MultipartFile> files) throws Exception
    {
        try
        {
            // 上传文件路径
            String filePath = RuoYiConfig.getUploadPath();
            List<String> urls = new ArrayList<String>();
            List<String> fileNames = new ArrayList<String>();
            List<String> newFileNames = new ArrayList<String>();
            List<String> originalFilenames = new ArrayList<String>();
            List<Long> ids = new ArrayList<>();
            for (MultipartFile file : files)
            {
                // 上传并返回新文件名称
                String fileName = FileUploadUtils.upload(filePath, file);
                String url = serverConfig.getUrl() + fileName;
                urls.add(url);
                fileNames.add(fileName);
                newFileNames.add(FileUtils.getName(fileName));
                originalFilenames.add(file.getOriginalFilename());

                SysFileInfo sysFileInfo = new SysFileInfo();
                sysFileInfo.setOriginalName(file.getOriginalFilename());
                sysFileInfo.setUrl(fileName);
                sysFileInfo.setExtName(file.getOriginalFilename().substring(file.getOriginalFilename().lastIndexOf(".") + 1));
                sysFileInfoService.save(sysFileInfo);
                ids.add(sysFileInfo.getId());
            }
            AjaxResult ajax = AjaxResult.success();
            ajax.put("urls", StringUtils.join(urls, FILE_DELIMETER));
            ajax.put("fileNames", StringUtils.join(fileNames, FILE_DELIMETER));
            ajax.put("newFileNames", StringUtils.join(newFileNames, FILE_DELIMETER));
            ajax.put("originalFilenames", StringUtils.join(originalFilenames, FILE_DELIMETER));
            ajax.put("id", StringUtils.join(ids, FILE_DELIMETER));
            return ajax;
        }
        catch (Exception e)
        {
            return AjaxResult.error(e.getMessage());
        }
    }

    /**
     * 本地资源通用下载
     */
    @GetMapping("/download/resource")
    public void resourceDownload(String resource, HttpServletRequest request, HttpServletResponse response)
            throws Exception
    {
        try
        {
            if (!FileUtils.checkAllowDownload(resource))
            {
                throw new Exception(StringUtils.format("资源文件({})非法，不允许下载。 ", resource));
            }
            // 本地资源路径
            String localPath = RuoYiConfig.getProfile();
            // 数据库资源地址
            String downloadPath = localPath + StringUtils.substringAfter(resource, Constants.RESOURCE_PREFIX);
            // 下载名称
            String downloadName = StringUtils.substringAfterLast(downloadPath, "/");
            response.setContentType(MediaType.APPLICATION_OCTET_STREAM_VALUE);
            FileUtils.setAttachmentResponseHeader(response, downloadName);
            FileUtils.writeBytes(downloadPath, response.getOutputStream());
        }
        catch (Exception e)
        {
            log.error("下载文件失败", e);
        }
    }
}
